Air pollution is contamination of the indoor or outdoor
environment by any chemical, physical or biological agent that modifies
the natural characteristics of the atmosphere. Household combustion
devices, motor vehicles, industrial facilities and forest fires are
common sources of air pollution. Pollutants of major public health
concern include particulate matter, carbon monoxide, ozone, nitrogen
dioxide and sulfur dioxide. Outdoor and indoor air pollution cause
respiratory and other diseases, which can be fatal.
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